Crystal properties

In this work, ZnFe2O4 nanoparticles were synthesized by hydrothermal method while the hummer method was used to synthesize GO nanosheet. GO/ZnFe2O4 nanocomposites (GO/ZFO) were prepared by mixing GO with ZnFe2O4 in mass ratio of 1:99, respectively.

8p viengfa 28-10-2024 3 1   Download

In this study, perovskite BaTiO3 and SrTiO3 catalysts were prepared using the sol-gel method for oxidative coupling of methane (OCM). Characterization of catalysts was investigated by X-ray diffraction for crystal properties, physical N2 adsorption to determine specific surface area, and temperatureprogrammed techniques to examine the redox properties and acid–base strength.

6p vikwong 29-09-2024 1 1   Download

The single phase of Mn0.5Fe2.5O4 spinel crystals was prepared by the microemulsion method with the oil phase is DGDE (diethylene glycol diethyl ether). The characteristics of the materials have been determined by the X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDX), Scanning electron microscopy (SEM) and Brunaure-Emmet-Teller (BET) nitrogen adsorption and desorption, Vibration sampling magnetometer (VSM), Fourier transform infrared spectroscopy (FTIR).

7p vikwong 29-09-2024 3 1   Download

In this report, the cold crystallization of bis[2-[(octylimino)methyl]-1-pyrenolato-N,O] copper(II) is studied and discussed using the magnetic properties, the FT-IR spectra, and thermal analyses.

6p vikwong 29-09-2024 6 1   Download

This study revealed that the major contributing descriptors of 2D QSAR studies are DeltaEpsilonB and DeltaPsiA and 3D QSAR model proves the steric as well as electrostatic effects determine the binding affinity for the drug development. The results of the current computational studies are useful for further designing novel chemical entities of anti-microbial agent.

19p dianmotminh02 03-05-2024 8 3   Download

The recent advances in the study of the unique capabilities of monolayer crystals had predicted piezoelectricity in two-dimensional (2D) group IV chalcogenides which are not present in their bulk forms. In this study, the predicted piezoelectric properties of was experimentally explored through Piezoelectric Force Microscopy (PFM). Tin Sulfide (SnS), Tin Selenide (SnSe), Germanium Sulfide (GeS), were exfoliated from their bulk forms by the top down methods of liquid sonication, while and Tin Disulfide (SnS2) mechanically exfoliated by tape.

82p runthenight04 02-02-2023 9 3   Download

Research objectives of the thesis: Clarification influence of the elements Na, Sr and Ba substituting for La/Ca and crystal size on the magnetic properties, phase transition and magnetocaloric effects of La0,7Ca0,3MnO3 materials. Found the materials for significant mmagnetocaloric parameters have potential for applications in magnetic refrigeration.Determine the effect of replacing Sr/Ba for Ca in La0,7Ca0,3MnO3 and Co substituting for Mn in La0,7Sr0,3MnO3 on their critical behavior as well as the ferromagnetic interactions order.

31p extraenglish 24-05-2021 24 4   Download

At a temperature of 300 K, both Ni and Cu atoms are crystallized into the face-centered cubic (FCC) and the hexagonal close-packed (HCP) phases, respectively. The mechanical characteristics of the sample at 300 K were also analyzed in detail through the determination of elastic modulus, number of atoms, and void distribution during the tensile process.

8p tamynhan5 10-12-2020 15 3   Download

In the present work, we use various routes, such as sol-gel, hydrothermal and solid state reaction methods, to synthesize zirconium titanate (ZrTiO4) and investigate the crystal structure, particle size distribution, morphology and optical properties of the calcined powders.

9p tamynhan8 04-11-2020 14 1   Download

Molecular crystals are characterized by strong intramolecular forces and much weaker intermolecular forces. High-pressure spectroscopic studies provide useful data for refining the various model potentials which are used to predict of the physical properties of such systems as well as for the formation of various crystalline phases.

7p tamynhan8 04-11-2020 16 2   Download

In this paper, we present the results of the study of the effect of residual La on crystal structure, magnetic properties of La1+ơFe11.05Si1.95 (ơ= 0.00; 0.03; 0.06 and 0.09) compounds. The analysis of X-ray diffractions showed that when the La content increases to 9, the structure still remains cubic in a typical NaZn13 arrangement with unchanged lattice constant (about 0.5).

6p tamynhan6 14-09-2020 28 3   Download

In this paper, we report a numerical calculation of the influence of structural parameters on the supercontinuum generation of photonic crystal fibers. A photonic crystal fiber based on the fused silica glass, eight rings of air holes ordered in a hexagonal lattice, is proposed. Guiding properties in terms of dispersion and confinement loss of the fundamental mode are also studied numerically. As a result, the broadband width of the supercontinuum spectrum will increase when the lattice pitch decreases or the diameter of air hole in the cladding increases.

8p kethamoi6 01-07-2020 30 4   Download

Analytical expressions for the anharmonic effective potential, local force constant, Displacement-displacement Correlation Function (DCF) CR and Debye-Waller factor described by the Mean Square Relative Displacement (MSRD) σ2 and by the Mean Square Displacement (MSD) u2of bcc crystals in the X-ray Absorption Fine Structure (XAFS) have been derived. The effective interatomic potential of the system has been considered by taking into account the influences of nearest atomic neighbors, and it contains the Morse potential characterizing the interaction of each pair of atoms.

8p 12120609 01-06-2020 14 2   Download

Influence of substitution of 3d metals for Mn on properties of La0.67Ca0.33Mn0.9 TM0.1O3 (TM = Fe, Co, Ni) compounds was studied. Ferromagnetic – paramagnetic and metals – insulator transitions were significantly affected by Mn-site substitution. However, no observable difference was found in their crystal structure from X-ray diffraction analysis. At room temperature the structure characterization of these compounds gave the single phase and structure is the distortion orthorhombic cell with space group symmetry Pnma.

12p 12120609 01-06-2020 13 2   Download

Objective of the thesis: Successfully fabricate Cu2O thin film having good crystal structure. Fabricate layers protecting Cu2O electrode from photocorrosion. Study the photocatalytic, electro-photocatalytic water splitting properties of the Cu2O electrode.

29p xacxuoc4321 08-07-2019 16 6   Download

In present paper, ADU has been produced via both the routes. Variation of uranium recovery and crystal structure and composition of ADU with progress in precipitation reaction has been studied with special attention on first appearance of the precipitate Further, ADU produced by two routes have been calcined to UO3, then reduced to UO2 and hydroflorinated to UF4. Effect of two different process routes of ADU precipitation on the characteristics of ADU, UO3, UO2 and UF4 were studied here.

8p minhxaminhyeu4 26-06-2019 32 0   Download

In this work, 200-nm-thick PZT films were successfully fabricated on Nb:STO substrates by a solution process. One obtained that PZT(111) peak started to appear on the Nb:STO substrate at a low annealing temperature of 450oC. Also, scanning electron microscopy observation shows smooth and homogeneous surface of PZT films on Nb:STO substrate with no grain boundary, which evidences for epitaxial-like growth of PZT thin films. Remnant polarization of 6 µC/cm2 and leakage current of 8×10-8 A were obtained at applied voltage of 5 V.

9p truongtien_09 08-04-2018 45 1   Download

The theoretical analysis of MTSM has been developed to model and simulate the signature of the sensor responses at harmonic frequencies. The signatures of the evaporation- induced deposition processes were investigated by studying the effect of the thickness and stiffness of the medium.

13p bautroibinhyen17 13-02-2017 46 3   Download

Crystals of pure calcite and calcites doped with different combinations of Mg(II), Sr(II) and Mn(II) ions were synthesized by precipitation method. Synthesized crystals were characterized by XRD and the results showed that they are in calcite phase. The thermoluminescence (TL) curves of synthetic calcites and calcite mineral were measured. The results indicated that the TL curve of pure synthetic calcite and that of calcite mineral have the same shape; manganous ion decreases, magnesium ion increases and strontium ion does not affect the TL properties of synthetic doped calcites.

5p uocvong03 24-09-2015 39 3   Download

One of the subjects of Ni-MH batteries studies is justly the electrochemically active material for the positive electrode-hydroxide nickel. This hydroxide Ni(OH)2 has been prepared in laboratory by chemical sedimentation from NiCl2 and NaOH solutions. The obtained product has been examined using different techniques, such as X ray Diffraction (XRD), Scanning Electronic Microscope (SEM) and electrochemical polarisation (cyclic voltammetry CV). The obtained results of obtained Ni(OH)2 show -type crystal, with grains of about 15 µm.

5p uocvong01 24-09-2015 50 4   Download